Small,
Journal Year:
2024,
Volume and Issue:
unknown
Published: Dec. 10, 2024
The
electrochemical
reduction
of
oxygen
is
pivotal
for
advancing
emerging
energy
technologies.
Precise
control
over
morphology
and
electronic
structure
essential
enhancing
catalytic
activity
stability
in
the
reaction
(ORR).
In
this
study,
a
freestanding
carbon
electrode
developed
by
in-situ
growth
nanotube
(CNT)-encapsulated
bimetallic
CoM
(M
=
Ni,
Fe,
Mn,
Cu)
nanoparticles
(NPs)
within
hierarchical
carbonized
wood
matrix
(CoM@NWCC).
hierarchically
porous
architecture
promotes
efficient
mass
transfer
during
ORR.
X-ray
photoelectron
spectroscopy
(XPS)
density
functional
theory
(DFT)
analyses
revealed
that
incorporating
metals
such
as
Cu
modulates
Co,
specifically
adjusting
distance
between
d-band
center
(E
Advanced Functional Materials,
Journal Year:
2025,
Volume and Issue:
unknown
Published: Jan. 2, 2025
Abstract
Carbon‐based
fibrous
supercapacitors
(FSSCs)
are
promising
power
sources
for
wearable
electronics,
often
compounding
with
transition
metal
oxides
(TMOs)
to
improve
energy
density.
However,
conventional
methods
introducing
TMOs
onto
exterior
surfaces
of
carbon‐based
fibers
typically
degrade
electrical
transport
and
cycle
stability.
Herein,
nanoconfined
MnO@Mn
2
O
3
heterojunctions
within
carbon
nanotube
(CNT)
(MOIC)
composite
FSSCs
stabilized
by
Mn─O─C
bonds,
exhibiting
record
stability
95.7%
capacitance
retention
after
10
000
cycles
89.4%
50
reported.
X‐ray
absorption
near
edge
structure
(XANES),
diffraction,
photoelectron
spectroscopy
(XPS)
analyses
confirm
heterostructure,
which
arises
through
a
partial
phase
transformation
from
MnO
Mn
,
as
further
supported
density
functional
theory
calculations.
chemical
verified
XPS,
extended
fine
structure,
XANES
analyses,
facilitate
3D
electron
transport,
enabling
MOIC
fiber
superior
conductivity
than
CNT
fiber.
The
nanoconfinement
2+
CNTs,
driven
capillary
effects
electrostatic
repulsion
between
protonated
CNTs
preserves
the
clean
CNTs.
This
configuration
enables
successful
wet‐spinning
three
times
tensile
strength
without
nanoconfinement.
work
opens
new
pathways
designing
carbon/metal
oxide
hybridized
storage
applications.
